books.google.co.il - How can a chemical we need on a daily basis to keep us healthy be fatal at a different dose? Why should elements that are intrinsically dangerous be used in medicine? How did poisoners use the chemical properties of chemicals to cover their tracks? Emsley gives detailed histories of five of the most...http://books.google.co.il/books/about/The_Elements_of_Murder_A_History_of_Pois.html?hl=iw&id=yeyfuCFgDj8C&utm_source=gb-gplus-shareThe Elements of Murder : A History of Poison